#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<errno.h>
#include<unistd.h>
 
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
 
#include<event.h>
#include<event2/bufferevent.h>
#include<event2/buffer.h>
#include<event2/util.h>
 
 
 
 
int tcp_connect_server(const char* server_ip, int port);
 
 
void cmd_msg_cb(int fd, short events, void* arg);
void server_msg_cb(struct bufferevent* bev, void* arg);
void event_cb(struct bufferevent *bev, short event, void *arg);
 
int main(int argc, char** argv)
{
    if( argc < 3 )
    {
        //两个参数依次是服务器端的IP地址、端口号
        printf("please input 2 parameter\n");
        return -1;
    }
 
    struct event_base *base = event_base_new();
 
    struct bufferevent* bev = bufferevent_socket_new(base, -1,
                                                     BEV_OPT_CLOSE_ON_FREE);
 
    //监听终端输入事件
    struct event* ev_cmd = event_new(base, STDIN_FILENO,
                                     EV_READ | EV_PERSIST,
                                     cmd_msg_cb, (void*)bev);
 
 
    event_add(ev_cmd, NULL);
 
    struct sockaddr_in server_addr;
 
    memset(&server_addr, 0, sizeof(server_addr) );
 
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(atoi(argv[2]));
    inet_aton(argv[1], &server_addr.sin_addr);
 
    bufferevent_socket_connect(bev, (struct sockaddr *)&server_addr,
                               sizeof(server_addr));
 
 
    bufferevent_setcb(bev, server_msg_cb, NULL, event_cb, (void*)ev_cmd);
    bufferevent_enable(bev, EV_READ | EV_PERSIST);
 
 
 
    event_base_dispatch(base);
 
    printf("finished \n");
    return 0;
}
 
 
 
 
 
void cmd_msg_cb(int fd, short events, void* arg)
{
    char msg[1024];
 
    int ret = read(fd, msg, sizeof(msg));
    if( ret < 0 )
    {
        perror("read fail ");
        exit(1);
    }
 
    struct bufferevent* bev = (struct bufferevent*)arg;
 
    //把终端的消息发送给服务器端
    bufferevent_write(bev, msg, ret);
}
 
 
void server_msg_cb(struct bufferevent* bev, void* arg)
{
    char msg[1024];
 
    size_t len = bufferevent_read(bev, msg, sizeof(msg));
    msg[len] = '\0';
 
    printf("recv %s from server\n", msg);
}
 
 
void event_cb(struct bufferevent *bev, short event, void *arg)
{
 
    if (event & BEV_EVENT_EOF)
        printf("connection closed\n");
    else if (event & BEV_EVENT_ERROR)
        printf("some other error\n");
    else if( event & BEV_EVENT_CONNECTED)
    {
        printf("the client has connected to server\n");
        return ;
    }
 
    //这将自动close套接字和free读写缓冲区
    bufferevent_free(bev);
 
    struct event *ev = (struct event*)arg;
    event_free(ev);
}
 